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Perhaps you had leakage from several cylinders,
A long time ago I tried K&W block sealer on a engine with very bad head gasket--- when started with a full radiator and the cap off it would erupt like " old faithful ", tried several sessions with sealer then gave up, the car got parked, 6 months later I was looking for a used radiator cap, noticed radiator still full, started car and no more problems ,so yes sitting can "fix" the leak